Chevrolet Trailblazer (2021–2026) Specs and Maintenance: What the Factory Schedule Says
The 2021–2026 Chevrolet Trailblazer is a small car with a small engine and a long factory service list — and the guide's data is unusually careful about which numbers are factory and which are dealer guidance. Everything below comes from the Trailblazer guide's Stock Specs, Engine Maintenance, Brakes, Tires and Wheels, and Differentials tabs, as listed in the guide on October 27, 2026. Where dealer guides disagree with the owner's manual, the manual wins here.
1. The two engines and the two gearboxes
Both engines are turbocharged, direct-injected, DOHC three-cylinders with variable valve timing. The 1.2L LIH makes 137 hp at 5,000 rpm and 162 lb-ft (some sources list 166 lb-ft); it is standard on FWD L/LS/LT and pairs with the CVT only. The 1.3L L3T makes 155 hp at 5,600 rpm and 174 lb-ft at 1,600 rpm, with a torque plateau from 1,600–4,000 rpm; it is standard on RS/ACTIV and all AWD cars and optional on FWD LT. The transmissions split by drivetrain: the CVT (VT40 family) is on all FWD models with either engine, and the GM Hydra-Matic 9-speed automatic (9T65) is on all AWD models, 1.3L only. There is no manual and no low range anywhere in the range. Front-wheel drive is standard; all-wheel drive is optional, on-demand with driver-selectable Normal, AWD, and Sport modes (FWD cars get a Snow mode instead of AWD), and AWD was not offered on the base L trim in the early years.
2. Dimensions, economy, towing, and cargo
The wheelbase is 103.9 in; length 173.5–174.2 in (Korean-market cars are slightly longer at 174.2 in); width 71.2–71.3 in; height 64.3–65.5 in; curb weight 2,996–3,241 lb. Ground clearance runs 7.5–8.0 in depending on trim and drivetrain — about 7.5 in for FWD, up to 8.0 in for AWD, with the ACTIV the tallest-riding trim. EPA combined fuel economy is 28–31 mpg: 1.3L FWD at 29 city / 33 hwy, 1.2L FWD at 28 city / 31 hwy, and 1.3L AWD at 26 city / 30 hwy, from a 13.2 gal fuel tank. Cargo is 25.3 cu ft behind the second row and 54.4 cu ft with the second row folded, and the front passenger seat folds flat for items up to 8.5 ft — a signature trick of the car. Towing is 1,000 lb maximum: trailering provisions are standard on AWD, while FWD cars require the 1.3L engine for trailering. Light-duty only — this is not a tow vehicle. Trims run L, LS, LT, ACTIV, and RS for 2021–2023; the base L was dropped for 2024, leaving LS, LT, ACTIV, and RS. The ACTIV is the rugged look (sport-terrain tires, skid-plate trim, tuned shocks); the RS is the sporty look (mesh grille, black bowtie, 18/19-in wheels, dual exhaust), with a two-tone roof option on ACTIV and RS. Safety: IIHS Top Safety Pick+ for 2021, with Small overlap Good, headlights Good/Acceptable, and front crash prevention Superior (vehicle-to-vehicle), plus standard Chevy Safety Assist — auto emergency braking, front pedestrian braking, and lane keep assist. Warranty, as listed in the guide from 2022 figures: 3 yr/36,000 mi basic, 5 yr/60,000 mi powertrain, 6 yr/100,000 mi corrosion, and 5 yr/60,000 mi roadside.
3. Oil: viscosity, capacity, and the Oil Life System
The factory viscosity, from the 2021 owner's manual (page 252) and flagged in the guide as superseding generic guidance: 1.3L takes SAE 0W-20 and 1.2L takes SAE 5W-30, full synthetic meeting dexos1. In extreme cold below -20 F, 0W-30 may be used for the 1.2L. Later guides list 0W-20 for both engines — the guide warns not to overwrite the 2021 manual's 1.2L = 5W-30 without checking the 2022 manual's Recommended Fluids page for the specific VIN year. Oil capacity with filter, as a fill guide: 1.2L takes 4.2 qt (4.0 L) and 1.3L takes 4.8 qt (4.5 L) — one 2021 guide lists the 1.3L as 4.7 qt, so use the dipstick to MAX; capacities are fill guides. Change the oil per the Oil Life System, at least once a year: the system uses engine revolutions and temperature, not a fixed mileage, and when the light comes on, change within 600 miles (1,000 km) and reset the system at every change. If the system is accidentally reset, change at 3,000 miles from the last change. Dealer service guides pair an oil change with tire rotation and a multi-point inspection every 7,500 miles or 1 year, whichever comes first — but that is dealer guidance, not a fixed factory mileage; the Oil Life System governs. GM does not recommend engine-oil flushes.
4. The factory service schedule
These intervals are the factory schedule from the 2023 owner's manual, as listed in the guide, and they supersede the dealer guidance rows elsewhere in the sheet:
- Cabin air filter: every 22,500 miles or 24 months, whichever comes first — sooner in heavy traffic, poor air quality, or high dust. (Dealer guides list 15,000 miles in one guide and 22,500 in another; inspect yearly and replace when airflow drops or odor appears.)
- Spark plugs: every 60,000 miles; inspect wires/boots. Severe conditions may require more frequent replacement. Turbo three-cylinders are plug-sensitive — misfires under boost point here first.
- Coolant: drain and fill every 150,000 miles or 6 years, whichever comes first. Fluid: 50/50 clean drinkable water + DEX-COOL only.
- Brake fluid: replace every 5 years. GM-approved DOT 4 only, from a clean sealed container.
- Transmission fluid: severe service every 45,000 miles; normal service has NO fixed interval. CVT fluid is High Performance CVT Fluid ("see your dealer"); the 9-speed takes DEXRON VI. The two fluids are different products — never interchange them. Severe means heavy city heat, hills, frequent towing, high-speed/competitive use, or taxi/police/delivery use. Do not publish a normal-service 45k or 97,500-mi interval as factory — the guide is explicit that dealer "general Chevy" 97,500-mi claims are NOT in this manual.
- Rear axle fluid, AWD: normal service every 150,000 miles; severe service 120,000 miles. Do not power-wash transfer-case/axle seals.
- Engine air filter: every 30,000–45,000 miles per dealer guidance — the guides differ, so inspect at 30,000. It protects the turbo; inspect for debris, especially after dusty/gravel use in ACTIV cars.
- Drive belts and hoses: inspect at 30,000 miles; check cooling hoses/clamps and the accessory belt for cracks. Turbo cars run hot — hose condition matters. Replace on condition, not mileage alone.
One interval the guide flags as UNVERIFIED and does not present as established: a 2026 guide lists a timing/oil-pump belt at 150,000 miles / 15 years for the 1.2L LIH, but that line was NOT found in the 2023 manual excerpt — verify against the 2022 manual before treating it as a 2022 interval. It is left out of the schedule above for that reason.
5. Brakes
Four-wheel disc brakes with four-wheel ABS and an electronic parking brake (no hand lever, no cable adjustment — if the EPB faults, it needs a scan tool). Front rotors are 11.8 in diameter per dealer spec sheets, rears 10.4 in — but one ACTIV road test cites 12.6-in front / 11.3-in rear, so rotor size appears to vary by source or trim: measure before ordering, or confirm by VIN. Disc rear on all trims; no rear drums on this generation. The brake-boost sensor recall 20V588 affected some 2021 cars — check the VIN. And do not rely on the supplied jack until recall 21V440 is done: the supplied jack can fracture if mispositioned, and dealers replace it free.
6. Tires, wheels, and the TPMS relearn
Factory sizes by trim: base L/LS 215/65R16 (Hankook Kinergy GT H436 OE on base cars); LT 225/60R17 on 17 x 7.5-in aluminum (the most common size); ACTIV 225/60R17 with Hankook Dynapro AT2 (RF11) sport-terrain tires OE; RS 2021–2023 225/55R18 (Hankook Kinergy GT 225/55R18H OE); RS 2024+ 245/45R19 — the 19-in size appears on 2024+ RS listings, so verify on the door placard before ordering. The spare is a compact 16-in steel, not full-size; check its pressure at every service. For 2026 cars the spare became optional and a tire-inflation kit standard. Bolt pattern is 5x115 (5 x 4.53 in), center bore 70.2 mm (2.76 in), M12 x 1.5 lugs, torque 103 lb-ft (140 Nm). The 2002–2009 Trailblazer used 6x127 — do NOT interchange. Tire chains are PROHIBITED on 225/60R17 and 225/55R18 (not enough clearance); use low-profile chains only on other sizes, front axle only, per the owner's manual, page 298. TPMS is direct: reset/relearn after rotation or sensor replacement. The relearn, as listed in the guide: DIC to the Tire Pressure screen, hold Set/Reset until the horn chirps twice, then use a relearn tool at each valve stem in LF/RF/RR/LR order (horn chirp each, double chirp at the end), and complete within 2 minutes or restart. A flashing-then-steady TPMS light means a malfunction, not just low pressure. Cold pressures are on the door placard — and early 2021 17-in cars had a tire label recall, 20V295.
7. The AWD system
The AWD is on-demand and driver-selectable — Normal, AWD, and Sport modes on AWD cars — with a single-speed rear drive unit and no low range. It is not a traditional transfer case, and there is no driver-locked 4WD. FWD Trailblazers have no rear differential or driveshaft to service. If the rear drive unit groans or binds in tight turns, have it inspected — the guide warns not to keep driving with the AWD fuse pulled as a "fix". Final-drive ratio varies by drivetrain and trim on dealer spec sheets (3.17 on an AWD LT example; 5.44 on a FWD LS example) — verify by VIN before ordering any driveline part. No fixed factory service interval for the system was published in the sources checked: check for leaks and noise at services, and verify the fluid type in the owner's manual before any fluid change.
What this page does not cover: a verified timing-belt interval (the 150,000-mi / 15-yr figure is unverified for 2022), a single definitive front rotor size (11.8 in vs 12.6 in by source), and any lift kit — none was verified for this car as of October 27, 2026. The guide does not state those, so they are left out rather than guessed. If a manual page contradicts anything here, the manual and your car's actual configuration win.
Open the full interactive Trailblazer guide for the complete engine maintenance table, stock specs, brakes, tires and wheels, and current for-sale listings.
Compiled from the Cerch Garage Chevrolet Trailblazer (2021–2026) guide (Stock Specs, Engine Maintenance, Brakes, Tires and Wheels, Differentials, and How-To Links tabs), as listed in the guide on October 27, 2026. Factory intervals are from the 2023 owner's manual as cited in the guide; dealer-guidance rows are labeled as such. Prices and specs are as listed in the guide and change; verify before buying anything.